I had a good experience, and thought I would pass it on as a resource for the forum.

https://www.redlinegoods.com/

The days of shift gates and AMCO door knobs have passed me by, I decided to go back to a shift boot.
I just have never loved the stock shifter either, truth be told. I decided to go with a Momo knob and custom boot instead.

I tracked down this source at Red Line.
The website is pretty user friendly, with plenty of options to customize.
I did double stitching in grey to match my cassette box cover.
It arrived well made, especially for the cost, and in 9 days.
I was pleased that they knew enough about our P-car that the top end hole was a rectangle to fit our flat shifter.
As I tracked the package, I noticed it was coming from Poland... but that didn't slow down the order somehow.

https://cimg3.ibsrv.net/gimg/rennlis...10c10d3ba.jpeg


https://cimg5.ibsrv.net/gimg/rennlis...f2580da6d.jpeg